Lenovo V480 Notebook - Manual (Page 71)

A sound problem
Print these instructions now and keep it with your computer for reference later.
No sound can be heard from the speakers even when the volume is turned up.
Make sure that:
• The mute function is off.
• The headphone jack is not used.
• Speakers are selected as the playback device.
Other problems
Print these instructions now and keep it with your computer for reference later.
Your computer does not respond.
Do either of the following:
• To turn off your computer, press and hold the power button for 4 seconds or more. If the computer still
does not respond, remove the ac power adapter and the battery.
• Your computer might lock when it enters sleep mode during a communication operation. Disable the
sleep timer when you are working on the network.
The computer does not start from a device you want.
Do the following:
1. Go to the Startup menu of the BIOS. Then select the Boot menu to make sure that the Boot Priority
Order option starts from the device you want.
2. Also make sure that the device from which the computer starts is enabled. Go to the Startup menu of the
BIOS. Then select the Boot menu to make sure that the device is included in the Boot Priority Order list.
3. Press F12 when the Lenovo logo appears on the screen while the computer is starting up to select
the device you want the computer starts from.
The connected external device does not work.
Make sure that:
• Do not connect or disconnect any external device cables other than USB cables while the computer is
turned on; otherwise, you might damage your computer.
• When using a high power consumption external devices such as an external USB optical drive, use
external device power adapter. Otherwise, the device may not be recognized, or the system might be
turned off.
For more technical support, go to http://www.lenovo.com/support.
Chapter 9 . Troubleshooting computer problems 57